Patent US2895860A successfully refreshed from Google Patents.
US2895860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure chill-castings of iron
Assignee: Renault SA
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Filing: 1956-07-25
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Granted: 1959-07-21
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Expires: 1976-07-25
Abstract
No abstract record available.
Inventors
- 👤 Peras Lucien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:00
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF OBTAINING MALLEABLE IRON OF PEARLITIC STRUCTURE CONTAINING DIFFUSED FINE PARTICLES OF GRAPHITE WHICH COMPRISE DIE CASTING IN A CHILL MOLD AN IRON SUITABLE FOR THE FORMATION OF PEARLITIC MALLEABLE IRON, STRIPPING THE CASTING FROM THE MOLD WHILE HOT, AND ABOVE 810*C. QUENCHING THE CASTING IN A SALT BATH AT TEMPERATURE OF ABOUT 180* C. FOR A PERIOD OF TIME UP THE CASTING IN STILL AIR, SUBJECTING THE CASTING TO A TEMPERATURE BETWEEN 400* TO 500* C. FOR A PERIOD OF TIME UP TO 5 HOURS SUFFICENT FOR EFFECTING FORMATION OF GRAPHITE NUCLIE SUBJECTING THE CASTING TO GRAPHITZATION OF THE PRIMARY CEMENTITE WITH HEAT AT A TEMPERATURE BETWEEN 850* AND 900*C. FOR 2 TO 6 HOURS.
Claim 2
Independent Claim
118 words
A METHOD OF OBTAINING MALLEABLE IRON OF PEARLITIC STRUCTURE CONTAINING DIFFUSED FINE PARTICLES OF GRAPHITE WHICH COMPRISE DIE CASTING IN A CHILL MOLD AN IRON SUITABLE FOR THE FORMATION OF PEARLITIC MALLEABLE IRON, STRIPPING THE CASTING FROM THE MOLD WHILE HOT, AND ABOVE 810*C. QUENCHING THE CASTING IN A SALT BATH AT TEMPERATURE OF ABOUT 180* C. FOR A PERIOD OF TIME UP THE CASTING IN STILL AIR, SUBJECTING THE CASTING TO A TEMPERATURE BETWEEN 400* TO 500* C. FOR A PERIOD OF TIME UP TO 5 HOURS SUFFICENT FOR EFFECTING FORMATION OF GRAPHITE NUCLIE SUBJECTING THE CASTING TO GRAPHITZATION OF THE PRIMARY CEMENTITE WITH HEAT AT A TEMPERATURE BETWEEN 850* AND 900*C. FOR 2 TO 6 HOURS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |